Bolt everything down, put the belt & clutch connector back on, fill the reservoir with
Type F (for pumps from '98-older vans), check for belt interference, and start it up. I had to tie the upper hose back slightly. This pump is silent compared to the C2.
If the pump foams, cycle the steering wheel lock-to-lock a couple of times at idle keeping the fluid level topped off in the reservoir, then shut the engine off for ~30min, and try again.

A pump from a '98-up van probably uses
MerconV, but few of them have Saginaw pumps (because they have modular engines - not smallblock V8s).